Composite concrete column and construction method using the same

ABSTRACT

A composite concrete column comprising: upper and lower concrete column portions extending in the lengthwise direction and having an exposed portion between the upper and lower concrete column portions; and an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion; and wherein the H-beam has a plurality of holes through which reinforcement bars for slab pass.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of Korean Patent Application No. 10-2008-0092546, filed Sep. 22, 2008, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a composite concrete column and a construction method using the same, more particularly to a composite concrete column and a construction method using the same by which installation of reinforcement bars and construction is convenient and stability and reliability is improved while shortening the period of construction.

2. Description of the Related Art

A building structure so called ‘a Rahmen structure’ consists of a crossbeam, a column and a slab. In constructing such a building structure, a slab is formed on the column and crossbeam, and cast in concrete with a mold. Since the procedure of installing the columns and the beams and concreting is conducted in place, it takes a lot of time and labor.

A composite concrete column is provided in Korean Patent No. 0797194 which consists of an H-beam and concrete column portions to decrease the labor and a period of construction.

According to the above patent, a pre-cast composite concrete column is installed and a crossbeam is connected to complete a building structure, which makes it convenient and easy to construct with a short period compared to the conventional method.

By the way, in the above construction reinforcement bars along the crossbeam interfere with the column to thereby discontinue at the contact point with the column.

Also, in case reinforcement bars are separately installed at both sides of column, it needs hard and inconvenient working with separate welding and it does not assure stability and reliability of load transfer.

SUMMARY OF THE INVENTION

The present invention is designed to solve the above problems of the prior art. It is an object of the invention to provide a composite concrete column having advantages of convenience of construction by adopting reinforcement bars passing through the column with discontinuation and enhancement of structural stability and reliability.

Another object of the present invention is to provide a construction method using the composite concrete column.

In order to accomplish the above object, the present invention provides a composite concrete column comprising: upper and lower concrete column portions extending in the lengthwise direction and having an exposed portion between the upper and lower concrete column portions; and an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion; and wherein the H-beam has a plurality of holes through which reinforcement bars for slab pass.

Preferably, the holes of the H-beam consist of first holes formed on flanges extending in parallel in the H-beam, and second holes formed on a web between the flanges, and wherein the first holes are formed at a height different form that of the second holes.

More preferably, a first H-beam formed at the lower portion of an upper first composite concrete column is couples to a second H-beam formed at the upper portion of a lower second composite concrete column to one piece of integral composite concrete column.

According to another embodiment, the present invention further comprises brackets attached to the side surface of the H-beam at the exposed portion.

According to another aspect of the present invention, there is provided a construction method comprising the following steps of: installing composite concrete columns including upper and lower concrete column portions extending in the lengthwise direction and having an exposed portion between the upper and lower concrete column portions, and an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion and having a plurality of holes; connecting ends of crossbeams to the H-beam at the exposed portion of the composite concrete columns; installing reinforcement bars for slab to pass through the holes of the H-beam along the crossbeam; installing molds on the composite concrete columns and the crossbeams; and putting concrete on the molds and curing the same.

Also, according to another aspect of the present invention, it is provided with a construction method comprising the following steps of: installing composite concrete columns including upper and lower concrete column portions extending in the lengthwise direction and having an exposed portion between the upper and lower concrete column portions, and an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion and having first holes formed on the upper and lower portions of flanges and second holes formed on the upper and lower portions of a web; connecting ends of crossbeams to the H-beam at the exposed portion of the composite concrete columns; installing reinforcement bars for slab to pass through at least one of the first holes and the second holes of the H-beam along the crossbeam; installing reinforcement bars for slab so that the ends of the reinforcement bars pass through at least one of the first holes and the second holes of the H-beam along the crossbeam to be fixed thereto; installing molds on the composite concrete columns and the crossbeams; and putting concrete on the molds and curing the same.

According to the present invention, reinforcement bars for slab pass through holes formed on a H-beam without discontinuation, which makes it very convenient and easy to install the reinforcement bars for building slab.

Also, since the reinforcement bars extend continuously at both side of column, it does not need to conduct a separate welding for support and preferable strength of momentum with stability and reliability can be obtained.

Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a perspective view schematically showing a composite concrete column according to a preferred embodiment of the present invention;

FIG. 2 is a perspective view schematically showing a composite concrete column according to another preferred embodiment of the present invention;

FIG. 3 is a perspective view schematically showing a composite concrete crossbeam connected to the composite concrete column according to the preferred embodiment of the present invention;

FIG. 4 is a perspective view schematically showing a construction state in which the composite concrete crossbeam is connected to the composite concrete column according to the preferred embodiment of the present invention;

FIG. 5 is a planar sectional view schematically showing a construction state in which the composite concrete crossbeam is connected to the composite concrete column according to the preferred embodiment of the present invention;

FIG. 6 is a perspective view schematically showing a construction state in which the composite concrete crossbeam is connected to the composite concrete column with installation of reinforcement bars for slab according to the preferred embodiment of the present invention;

FIG. 7 is a planar sectional view schematically showing a construction state in which the composite concrete crossbeam is connected to the composite concrete column with installation of reinforcement bars for slab according to the preferred embodiment of the present invention;

FIG. 8 is a sectional view schematically showing a construction state in which a deck plate is installed on the composite concrete crossbeam and cast with concrete.

FIG. 9 is a perspective view schematically showing a slab built according to the preferred embodiment of the present invention;

FIG. 10 is a perspective view schematically showing a construction state of outer area in which the composite concrete crossbeams are connected to the composite concrete column according to the preferred embodiment of the present invention;

FIG. 11 is a planar sectional view schematically showing a construction state of outer area in which the composite concrete crossbeams are connected to the composite concrete column according to the preferred embodiment of the present invention;

FIG. 12 is a perspective view schematically showing a composite concrete column according to another preferred embodiment of the present invention;

FIG. 13 is a perspective view schematically showing a bracket for connecting a crossbeam with a composite concrete column according to a preferred embodiment of the present invention;

FIG. 14 is a perspective view schematically showing a composite concrete crossbeam connected to the composite concrete column using the bracket of FIG. 13 according to the preferred embodiment of the present invention;

FIG. 15 is a perspective view schematically showing a composite concrete column according to still another preferred embodiment of the present invention;

FIG. 16 is a perspective view schematically showing a composite concrete crossbeam connected to the composite concrete column of FIG. 15 according to the preferred embodiment of the present invention;

FIG. 17 is a perspective view schematically showing a composite concrete column according to further another preferred embodiment of the present invention;

FIG. 18 is a perspective view schematically showing a composite concrete crossbeam connected to the composite concrete column of FIG. 17 according to the preferred embodiment of the present invention;

FIG. 19 is a perspective view schematically showing a composite concrete column according to still more another preferred embodiment of the present invention;

FIG. 20 is a perspective view schematically showing a composite concrete column according to another preferred embodiment of the present invention;

FIG. 21 is a partially perspective view schematically showing the connection of composite concrete crossbeams and the composite concrete column of FIG. 20 according to the preferred embodiment of the present invention;

FIG. 22 is a partially sectional view schematically showing a composite concrete crossbeam connected to the composite concrete column of FIG. 20 according to the preferred embodiment of the present invention;

FIG. 23 is a partially perspective view schematically showing the connection of composite concrete crossbeams and the composite concrete column of FIG. 20 according to the preferred embodiment of the present invention;

FIG. 24 is a partially perspective view schematically showing the connection of composite concrete crossbeams and the composite concrete column of FIG. 20 according to the preferred embodiment of the present invention;

FIG. 25 is a partially sectional view schematically showing the connection of composite concrete crossbeams and the composite concrete column according to another preferred embodiment of the present invention; and

FIG. 26 is a partially perspective view schematically showing the connection of composite concrete crossbeams and the composite concrete column according to another preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

FIG. 1 shows a composite concrete column according to a preferred embodiment of the present invention. Referring to FIG. 1, a composite concrete column of the present invention comprises concrete column portions 10 and 20 extending lengthwise, and an H-beam 30 connected between ends of the concrete column portions 10 and 20 to be exposed.

The concrete column portion 10 and 20 is a main body and preferably have a section of square, rectangle, circle or the like.

The concrete column portions comprise an upper concrete column portion 10 and a lower concrete column portion 20 so that an exposed portion 15 where the H-beam 30 is exposed is formed between the lower end of the upper concrete column portion 10 and the upper end of the lower concrete column portion 20. As described later, the end of crossbeam is connected to the exposed portion 15 so that the exposed portion 15 is located as high as a slab is formed.

According to the present embodiment, the H-beam 30 is connected with the concrete column portions 10 and 20 so that both ends of the H-beam 30 are embedded in the concrete column portions 10 and 20. That is, an upper end of the H-beam is embedded in the lower end of the upper concrete column portion 10, and lower end of the H-beam is embedded in the upper end of the lower concrete column portion 20. More preferably, a plurality of studs (not shown) with an embedded plate are formed on the side surface of embedded portion of the H-beam 30, which results in firm connection with the concrete column portion.

According to the present invention, the H-beam 30 of the exposed portion 15 is formed with a plurality of holes 30 a and 30 b which reinforcement bars for slab pass through. That is, the holes consist of first holes 30 a which are formed on flanges 31 and 32 extending in parallel at both sides of the H-beam 30, and second holes 30 b which are formed on a web 33 between the flanges 31 and 32.

The number of the holes 30 a and 30 b is not limited to the present embodiment and may be determined considering the size and required strength of the column, the crossbeam and the slab.

According to the present invention, the first and second holes 30 a and 30 b are formed at different height to prevent reinforcement bars for slab passing through the holes 30 a and 30 b from interfering with each other. Accordingly, the reinforcement bars for slab passing through the first holes 30 a extend rectangular to the reinforcement bars passing through the second holes 30 b.

The concrete column portions 10 and 20 and the H-beam 30 may be configured in various ways illustrated in FIG. 2 which is one of the modification.

A composite concrete column of the present embodiment comprises upper and lower concrete column portions 10′ and 20′ extending lengthwise, and an H-beam 30 connected between ends of the concrete column portions 10′ and 20′ to be exposed and having a plurality of holes 30 a and 30 b which the reinforcement bars for slab pass through.

Also, the composite concrete column further comprises a plurality of reinforcement rods 40 embedded in the concrete column portions 10′ and 20′ around the H-beam 30 to extend lengthwise. Here, the reinforcement rods 40 are installed at the position where the reinforcement bars for slab passing through the holes 30 and 30 b do not interfere with the reinforcement rods 40.

The H-beam 30 has a plurality of brackets 42 at the exposed portion 15 between the concrete column portion 10′ and 20′ to connect the crossbeam. For example, the bracket 42 may be T-shaped steel member having fastening holes 42 a that is welded to the side surface of the H-beam 30. However, the brackets are not limited to the present embodiment, and may be modified so as to connect ends of crossbeam by means of fasteners.

More preferably, upper ends of the concrete column portion 10′ and 20′ have a support portion 22 laterally extending to stably support the end of the crossbeam which is placed on the support portion 22.

Although the composite concrete column is illustrated in detail with reference to the drawings, but not limited thereto and may be configured to the embodiment disclosed in Korean Patent No. 0797194.

Now the construction method using the above composite concrete column will be described.

First, a composite concrete column is manufactured in the factory in advance, and then transferred and fixed to the ground at the lower end of the concrete column portion 20.

Subsequently, the end of a crossbeam is connected to the H-beam 30 at the exposed portion 15 of the composite concrete column. In the present invention, the crossbeam denotes an H-beam or a structure having an H-beam. More preferably, the crossbeam comprises the composite concrete crossbeam as shown in FIG. 3.

In a preferred embodiment, the composite concrete crossbeam comprises an H-beam 50, stirrup bars 51 installed at a predetermined interval along the H-beam 50, and a concrete member 52 embedding at least a portion of the H-beam 50.

The stirrup bars 51 make a compression force along the H-beam 50 to apply evenly through the section of the H-beam, and resist to a shear force applied in the direction rectangular to the H-beam. It should be understood that various kinds of stirrup bars may be adopted, not limited to the embodiment.

The concrete member 52 is formed integrally on the H-beam 50 lengthwise to embed at least a portion of the length of the H-beam. Preferably, the concrete member 52 embeds at least a part of the lower flange 53.

The concrete member 52 effectively resists to a bending force and a compression force together with the H-beam 50. Also, the concrete member 52 increases in the sectional area of the composite concrete column to thereby strengthen the resistance to external forces.

As shown in the drawing, both ends of the H-beam 50 are exposed out of the concrete member 52 so that the composite concrete crossbeam can be connected to the composite concrete column of the present invention. To do so, fastening holes 50 a may be formed at the ends of the H-beam 50.

Preferably, the composite concrete crossbeam comprises extension/compression bars which resist to an extension force and a compression force applied to the composite concrete crossbeam. Preferably, the extension/compression bars comprise a plurality of embedded bars 54 embedded in the concrete member at the lower portion of the H-beam 50 in the lengthwise direction, and exposed bars 55 which are not embedded in the concrete member 52.

The exposed bars 55 will be embedded in the concrete member of slab together with other reinforcement bars for slab. Accordingly, it should be understood that the reinforcement bars for slab include the embedded bars 54 and the exposed bars 55 hereinafter.

Although the composite concrete crossbeam is illustrated in detail with reference to the drawings, but not limited thereto and may be configured to the embodiment disclosed in Korean Patent Nos. 0640250, 0761785 and 0761786.

FIG. 4 illustrates the state in which composite concrete crossbeams 200 having the above mentioned configuration are connected to the composite concrete columns of the present invention.

Specifically, the end of the H-beam 50 of the composite concrete crossbeam 200 is connected to the H-beam 30 at the exposed portion 15 of the composite concrete column by welding.

Alternatively, with the bracket 42 provided on the H-beam 30 of the composite concrete column as shown in FIG. 2, the end of the H-beam 50 of the composite concrete crossbeam 200 is connected to the bracket 42 directly or by means of a connection plate (not shown) with fasteners such as bolts.

Another method for connecting the composite crossbeam 200 with the H-beam 30 of the composite concrete column 100 is illustrated in FIGS. 12 through 14. Here, like reference numerals denote the same components as those in the previous drawings.

According to the present embodiment, the composite concrete crossbeam 200 is connected to the H-beam 30 of the composite concrete column 100 by a bracket of FIG. 13.

The bracket includes a flat portion 70 attached to the flanges 31 and 32 or the web 33 of the H-beam 30 of the composite concrete column 100, and a protrusion portion 71 protruding from the flat portion 70 at the center thereof.

The flat portion 70 has a plurality of holes 70 a to correspond to the first and second holes 30 a and 30 b, and the protrusion portion 71 has a plurality of fastening holes 71 a to connect the crossbeam.

As shown in FIG. 14, the flat portion 70 of the bracket is fixed to the H-beam 30 of the composite concrete column 100. That is, the flat portion 70 is connected with the flanges 31 and 32 or the web 33 of the H-beam 30 by bolts 81. Here, the corresponding holes 70 a align with the first holes 30 a or the second holes 30 b to enable the reinforcement bars for slab to pass through the holes 30 a and 30 b.

Also, the web of the H-beam 50 of the composite concrete crossbeam 200 is connected to the protrusion portion 71 by bolts 82 inserted into the fastening holes 50 a at the end of the H-beam 50 and the fastening holes 71 a of the protrusion portion 71.

Preferably, the ends of flanges of the H-beam 50 are welded to the H-beam 30 of the composite concrete column 100.

FIGS. 15 and 16 illustrate the connection of the composite concrete crossbeams 200 to the composite concrete column 100 according to still another embodiment of the present invention. Here, like reference numerals denote the same components as those in the previous drawings.

In the present embodiment, a pair of horizontal brackets 72 is welded between the flanges 31 and 32 of the H-beam 30 at the exposed portion 15 of the composite concrete column 100. The horizontal brackets 72 are spaced at the same interval as that of the flanges of the H-beam 50 of the composite concrete crossbeam 200.

Also, a protrusion bracket 73 protrudes between the horizontal brackets 72 to have a plurality of fastening holes 73 a. The protrusion bracket 73 is connected with the web of the H-beam 50 of the composite concrete crossbeam 200.

FIG. 16 illustrates the state in which composite concrete crossbeams 200 are connected to the composite concrete columns of the present invention.

As shown in the drawing, the end of web of the H-beam 50 in the composite concrete crossbeam 200 is connected to the protrusion bracket 73 by means of bolts 83 inserted into the fastening holes 50 a of the H-beam 50 and the fastening holes 73 a of the protrusion bracket 73.

Also, the ends of the flanges of the H-beam 50 are welded to the horizontal bracket 72 to facilitate reinforcement.

FIGS. 17 and 18 illustrate the connection of the composite concrete crossbeams 200 to the composite concrete column 100 according to further another embodiment of the present invention. Here, like reference numerals denote the same components as those in the previous drawings.

According to the present embodiment, a T-shaped bracket 74 is connected to the H-beam 30 at the exposed portion 15 of the composite concrete column 100.

The end of a vertical member of the T-shaped bracket 74 is welded to the web 33 of the H-beam 30, and both ends of a flat member of the T-shaped bracket 74 are welded to the flanges 31 and 32, respectively with the bottom surface of the flat member of the T-shaped bracket exposed to the outside.

A rectangular bracket 75 formed with a plurality of fastening holes 75 a is fixed to the exposed bottom surface of the flat member of the T-shaped bracket 74.

Referring to FIG. 18, the ends of the flanges of the H-beam 50 in the composite concrete crossbeam 200 are welded to the exposed bottom surface of the flat member of the T-shaped bracket 74, while the fastening holes 50 a on the web of the H-beam 50 and the fastening holes 75 a of the rectangular bracket 75 are aligned with each other to be fastened by bolts 84.

The above-explained connecting method may be selectively applied to the flanges 31 and 32 and the web 33 of the H-beam 30. For example, the connection of the flanges 31 and 32 may be different from that of the web 33.

The present invention provides a pair of composite concrete columns that are connected with each other in the vertical direction at the exposed portion 15.

Referring to FIG. 19, a first H-beam 30′ formed at the lower portion of an upper first composite concrete column 100′ is welded to a second H-beam 30″ formed at the upper portion of an lower second composite concrete column 100″ to one piece of integral composite concrete column.

Preferably, the first H-beam 30′ has a plurality of holes 30 a and 30 b through which the reinforcement bars for slab pass.

In the case of the above configuration, the connection portion of the two H-beams 30′ and 30″ is the exposed portion to be connected with the crossbeam, while the concrete member of the first composite concrete column 100′ becomes an upper concrete column portion and the concrete member of the second composite concrete column 100″ becomes an lower concrete column portion.

The crossbeam may be connected to the exposed portion of the H-beam in the composite concrete column in the same manner as the previous embodiment, which will be omitted.

Alternatively, the first and second H-beams 30′ and 30″ of the first and second composite concrete column 100′ and 100″ may be coupled be means of plates or brackets.

FIG. 5 shows the composite concrete column 100 wherein four composite concrete crossbeam 200 are connected to the H-beam 30 of the same.

Preferably, the end of the concrete member 52 of the composite concrete crossbeam 200 is placed on the upper surface of the lower concrete column portion 20 or on the support portion 22 of FIG. 2 of the composite concrete column. The above configuration facilitates the connection of the composite concrete column and the crossbeam with structural stability.

Subsequently, reinforcement bars for slab and molds are installed on the crossbeam. FIGS. 6 and 7 show the state in which the reinforcement bars for slab are installed according to the present invention.

The reinforcement bars 60 and 62 for slab along the composite concrete crossbeam 200 pass through the holes 30 a and 30 b formed on the H-beam 30 of the composite concrete column. That is, a first reinforcement bars 60 along the composite concrete crossbeam 200 pass through the first holes 30 a on the flanges 31 and 32 of the H-beam 30, and a second reinforcement bars 62 perpendicular to the first reinforcement bars 60 pass through the second holes 30 b on the web 33 of the H-beam 30.

Since the first holes 30 a are located at the height different from that of the second holes 30 b, the first reinforcement bars 60 for slab do not interfere with the second reinforcement bars 62 for slab.

At the same time, a mold structure such as a deck plate 300 of FIG. 8 may be placed on the composite concrete crossbeams 200. Such an installation of deck plates 300 may be conducted according to Korean Patent No. 0761786, which will be omitted.

Although not shown in the drawing, the reinforcement bars may be installed on the deck plate 300 in various kinds of configuration. Such a configuration does not limited by the present invention.

Also, concrete is put on the mold with the reinforcement bars and cured to build a slab. FIG. 9 shows a slab built by the present invention.

The construction method of the present invention using the composite concrete column is also applied to side wall of the building.

That is, three composite concrete crossbeams 200 are connected to the composite concrete column at the side wall of the building in FIGS. 10 and 11. Here, first reinforcement bars 60′ for slab pass through holes formed on the flanges 31 and 32 of the H-beam 30 in the composite concrete column, and second reinforcement bars 62′ pass through holes formed on the web 33 of the H-beam 30.

The connection of the composite concrete column and the crossbeams of the present embodiment is the same as the previous embodiment, which will be omitted.

FIG. 20 shows the configuration of a composite concrete column according to another preferred embodiment of the present invention.

Referring to the drawing, a composite concrete column of the present embodiment comprises concrete column portions 10 and 20 extending lengthwise, and an H-beam 30 connected between ends of the concrete column portions 10 and 20 to be exposed.

According to the present embodiment, the H-beam 30 is formed with a plurality of holes 30 a, 30 a′, 30 b and 30 b′ which reinforcement bars for slab pass through. That is, the holes consist of first holes 30 a and 30 a′ which are formed on the upper and lower portions of the flanges 31 and 32 of the H-beam 30, and second holes 30 b and 30 b′ which are formed on the upper and lower portions of the web 33 between the flanges 31 and 32, respectively. Other holes are for fastening brackets or the like.

Preferably, the first holes 30 a and 30 a′ are formed at different height from the second holes 30 b and 30 b′ to prevent reinforcement bars for slab passing through the holes from interfering with each other.

FIGS. 21 and 22 illustrate the state in which four composite concrete crossbeams 210, 220, 230 and 240 are connected with the composite concrete column of FIG. 20.

In the present embodiment, the connection between the H-beam of the composite concrete crossbeam and the H-beam 30 of the composite concrete column is the same as described in the previous embodiments and will be omitted.

Referring to the drawings, the reinforcement bars for slab provided on the composite concrete crossbeams 210, 220, 230 and 240 comprise upper reinforcement bars 60 a and 62 a and lower reinforcement bars 60 b (and see 62 b of FIG. 23).

According to the present embodiment, the installation of the reinforcement bars with respect to the H-beam 30 of the composite concrete column varies between the composite concrete crossbeams 210 and 220 which are connected to the flanges 31 and 32 of the H-beam 30 and the composite concrete crossbeam 230 and 240 which are connected to the web 33.

Specifically, ends of the upper reinforcement bars 60 a and the lower reinforcement bars 60 b of the composite concrete crossbeams 210 and 220 connected to the flanges 31 and 32 of the H-beam 30 pass through the first holes 30 a and 30 a′ formed on the upper and lower portions of the flanges 31 and 32 respectively by a predetermined length, preferably, 5 cm, to be then fixed to the flanges 31 and 32 by welding or fixing members 80 a and 80 b.

In the case of fixing members 80 a and 80 b, the ends of the upper and lower reinforcement bars 60 a and 60 b are threaded to thereby engage with the fixing members 80 a and 80 b. The upper and lower reinforcement bars 60 a and 60 b may be stably fixed to the flanges 31 and 32 by rotating the fixing members 80 a and 80 b at both ends.

Meanwhile, the upper reinforcement bars 62 a of the composite concrete crossbeam 230 and 240 connected to the web 33 of the H-beam 30 pass through the second holes 30 b formed on the upper portion of the web 33 to extend lengthwise as described in the former embodiment.

Also, the lower reinforcement bars 62 b of one composite concrete crossbeam 240 connected to the web 33 pass through the second holes 30 b′ formed on the lower portion of the web 33 by a predetermined length to be then fastened by fixing members 80 c.

At the same time, the lower reinforcement bars 62 b of the other composite concrete crossbeam 230 connected to the web 33 are bent at the end not to interfere with the web 33 as shown in FIG. 23.

Here, other members except for H-beam and reinforcement bars are omitted in FIGS. 23 and 24 for convenience.

According to another embodiment of the present invention, all the ends of the lower reinforcement bars 62 b of the composite concrete crossbeams 230 and 240 connected to the web 33 of the H-beam 30 may be bent as set forth before.

FIGS. 25 and 26 show another preferred embodiment of the present invention wherein four composite concrete crossbeams 210, 220, 230 and 240 are connected with the composite concrete column of FIG. 20. Here, like reference numerals denote the same components as those in the previous drawings.

The upper reinforcement bars 60 a of the composite concrete crossbeams 210 and 220 connected to the flanges 31 and 32 of the H-beam 30 pass through the first holes 30 a formed on the upper portion of the flanges 31 and 32 to extend lengthwise, in the present embodiment.

While, the ends of the lower reinforcement bars 60 b of the composite concrete crossbeams 210 and 220 connected to the flanges 31 and 32 pass through the first holes 30 a′ formed on the lower portion of the flanges 31 and 32 by a predetermined length to be then fastened by the fixing members 80 b.

That is, the upper reinforcement bars 60 a of the composite concrete crossbeams 210 and 220 extend by passing through the first holes 30 a, while the lower reinforcement bars 60 b thereof are fixed at the flanges by the fixing members 80 b.

The configuration of the upper and lower reinforcement bars 62 a and 62 b of the composite concrete crossbeams 230 and 240 connected to the web 33 of the H-beam 30 is the same as described in the previous embodiments and will be omitted.

Also, subsequent procedures like installation of the deck molds and supply of concrete may be conducted as described in the previous embodiments.

Although the above-described embodiments are directed to the case that four crossbeams are connected to the composite concrete column of the present invention, not limited thereto, but may be applied to the connection of two or three crossbeams with respect to the composite concrete column.

Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents. 

1. A composite concrete column comprising: upper and lower concrete column portions extending in the lengthwise direction and having an exposed portion between the upper and lower concrete column portions; and an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion; and wherein the H-beam has a plurality of holes through which reinforcement bars for slab pass.
 2. The composite concrete column according to claim 1, wherein the holes of the H-beam consist of first holes formed on flanges extending in parallel in the H-beam, and second holes formed on a web between the flanges, and wherein the first holes are formed at a height different from that of the second holes.
 3. The composite concrete column according to claim 2, wherein a first H-beam formed at the lower portion of an upper first composite concrete column is welded to a second H-beam formed at the upper portion of an lower second composite concrete column to one piece of integral composite concrete column.
 4. The composite concrete column according to claim 2, further comprising brackets attached to the side surface of the H-beam at the exposed portion.
 5. The composite concrete column according to claim 4, wherein the bracket comprises: a flat portion attached to the flanges or the web of the H-beam, the flat portion having holes corresponding to the holes of the H-beam; and a protrusion portion protruding from the flat portion at the center thereof, the protrusion portion having fastening holes for connecting a crossbeam.
 6. The composite concrete column according to claim 4, further comprising a pair of horizontal brackets installed between the flanges of the H-beam, and a protrusion bracket protruding between the horizontal brackets.
 7. The composite concrete column according to claim 4, further comprising a T-shaped bracket having a vertical member welded to the web of the H-beam and a flat member welded to the flanges of the H-beam, and a rectangular bracket fixed to the bottom surface of the flat member of the T-shaped bracket.
 8. The composite concrete column according to claim 1, wherein the holes of the H-beam consist of first holes formed on the upper and lower portions of flanges extending in parallel in the H-beam, and second holes formed on the upper and lower portions of a web between the flanges, and wherein the first holes are formed at a height different from that of the second holes.
 9. A construction method comprising the following steps of: installing composite concrete columns including upper and lower concrete column portions extending in the lengthwise direction and having an exposed portion between the upper and lower concrete column portions, and an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion and having a plurality of holes; connecting ends of crossbeams to the H-beam at the exposed portion of the composite concrete columns; installing reinforcement bars for slab to pass through the holes of the H-beam along the crossbeam; installing molds on the composite concrete columns and the crossbeams; and putting concrete on the molds and curing the same.
 10. The construction method according to claim 9, further comprising the steps of: attaching a plurality of brackets to the side surface of the H-beam at the exposed portion; and connecting the end of H-beam to the brackets.
 11. A construction method comprising the following steps of: installing composite concrete columns including upper and lower concrete column portions extending in the lengthwise direction and having an exposed portion between the upper and lower concrete column portions, and an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion and having first holes formed on the upper and lower portions of flanges and second holes formed on the upper and lower portions of a web; connecting ends of crossbeams to the H-beam at the exposed portion of the composite concrete columns; installing reinforcement bars for slab to pass through at least one of the first holes and the second holes of the H-beam along the crossbeam; installing reinforcement bars for slab so that the ends of the reinforcement bars pass through at least one of the first holes and the second holes of the H-beam along the crossbeam to be fixed thereto; installing molds on the composite concrete columns and the crossbeams; and putting concrete on the molds and curing the same.
 12. The construction method according to claim 11, further comprising the steps of: fixing the ends of upper reinforcement bars and lower reinforcement bars of the composite concrete crossbeams connected to the flanges of the H-beam to pass through the first holes formed on the upper and lower portions of the flanges respectively by a predetermined length, to be then fixed to the flanges; installing upper reinforcement bars of the composite concrete crossbeam connected to the web of the H-beam to pass through the second holes formed on the upper portion of the web to extend lengthwise; fixing the ends of lower reinforcement bars of one composite concrete crossbeam connected to the web to pass through the second holes formed on the lower portion of the web by a predetermined length to be then fixed to the web; and bending the end of lower reinforcement bars of the other composite concrete crossbeam connected to the web not to interfere with the web.
 13. The construction method according to claim 12, wherein the ends of the upper reinforcement bars and the lower reinforcement bars of the composite concrete crossbeams connected to the flanges of the H-beam are fixed to the flanges by welding or fixing members, and wherein the ends of the lower reinforcement bars of the one composite concrete crossbeam connected to the web are fixed to the web by welding or fixing members.
 14. The construction method according to claim 11, further comprising the steps of: fixing the ends of upper reinforcement bars and lower reinforcement bars of the composite concrete crossbeams connected to the flanges of the H-beam to pass through the first holes formed on the upper and lower portions of the flanges respectively by a predetermined length, to be then fixed to the flanges; installing upper reinforcement bars of the composite concrete crossbeam connected to the web of the H-beam to pass through the second holes formed on the upper portion of the web to extend lengthwise; and bending the end of lower reinforcement bars of the composite concrete crossbeam connected to the web not to interfere with the web.
 15. The construction method according to claim 14, wherein the ends of the upper reinforcement bars and the lower reinforcement bars of the composite concrete crossbeams connected to the flanges of the H-beam are fixed to the flanges by welding or fixing members.
 16. The construction method according to claim 11, further comprising the steps of: Installing upper reinforcement bars of the composite concrete crossbeams connected to the flanges of the H-beam to pass through the first holes formed on the upper portion of the flanges; fixing the ends of lower reinforcement bars of the composite concrete crossbeams connected to the flanges of the H-beam to pass through the first holes formed on the lower portion of the flanges by a predetermined length, to be then fixed to the flanges; installing upper reinforcement bars of the composite concrete crossbeam connected to the web of the H-beam to pass through the second holes formed on the upper portion of the web to extend lengthwise; fixing the ends of lower reinforcement bars of one composite concrete crossbeam connected to the web to pass through the second holes formed on the lower portion of the web by a predetermined length to be then fixed to the web; and bending the end of lower reinforcement bars of the other composite concrete crossbeam connected to the web not to interfere with the web.
 17. The construction method according to claim 16, wherein the ends of the lower reinforcement bars of the composite concrete crossbeams connected to the flanges of the H-beam are fixed to the flanges by welding or fixing members, and wherein the ends of the lower reinforcement bars of the one composite concrete crossbeam connected to the web are fixed to the web by welding or fixing members.
 18. The construction method according to claim 11, further comprising the steps of: installing upper reinforcement bars of the composite concrete crossbeams connected to the flanges of the H-beam to pass through the first holes formed on the upper portion of the flanges; fixing the ends of lower reinforcement bars of the composite concrete crossbeams connected to the flanges of the H-beam to pass through the first holes formed on the lower portion of the flanges by a predetermined length, to be then fixed to the flanges; installing upper reinforcement bars of the composite concrete crossbeam connected to the web of the H-beam to pass through the second holes formed on the upper portion of the web to extend lengthwise; bending the ends of lower reinforcement bars of one composite concrete crossbeam connected to the web not to interfere with the web.
 19. The construction method according to claim 18, wherein the ends of the lower reinforcement bars of the composite concrete crossbeams connected to the flanges of the H-beam are fixed to the flanges by welding or fixing members. 